Strong Build. Smooth Finish.
PROSAUNAS Alder 3×3 S4SEE SHP is a premium engineered sauna wood designed to provide structural strength and a refined finish for benches and support frameworks. With smooth faces on all four sides and gently eased edges, it delivers both durability and comfort in high-use areas.
Alder is a trusted sauna material known for its consistent grain, smooth texture, and reliable performance in high-heat environments. It resists splintering and remains comfortable to the touch, making it ideal for structural and seating applications.
Each piece features an SHP (Square Edge Profile), offering clean, defined lines and versatile use for framing, supports, and bench construction. Its precise dimensions and engineered stability ensure easy installation and long-term performance.
PROSAUNAS selects high-quality alder to ensure uniform color, fine texture, and dependable durability. Suitable for both residential and commercial sauna builds, it’s a reliable choice for strong, long-lasting construction.
Features & Benefits
| Feature | Benefit - Why It Matters to Your Build |
|---|---|
| Alder Wood | Natural hardwood suited for sauna interiors - offers durability, smooth texture, and a warm, consistent appearance. |
| S4SEE Finish (Smooth 4 Sides, Eased Edges) | Finished on all faces with softened edges - ensures comfort and a refined surface. |
| Inside Corner Application | Designed for internal wall joints - delivers a clean, finished look in corner areas. |
| Smooth Surface Finish | Refined, even texture across all faces - enhances comfort and visual appeal. |
| Untreated Natural Material | No thermal processing or coatings - preserves the wood’s natural character and performance. |
| Performs in Sauna Conditions | Handles heat without splintering or overheating - safe and reliable for interior use. |
| Consistent Color & Grain | Warm tone with subtle grain pattern - creates a cohesive and attractive finish. |
| Stable & Durable Material | Maintains shape under heat and humidity - supports long-term performance. |
| Easy to Work With | Uniform pieces allow clean cuts and simple installation - ideal for precise trim work. |
| Ideal for Corner Finishing Details | Protects and refines exposed edges - enhances both function and overall sauna design. |
Why Alder Support Wood for Your Sauna Interior?
Three reasons builders choose Alder for seamless sauna corner details.
Comfortable in Sauna Heat
Alder remains smooth and pleasant in high temperatures. It resists splintering and overheating - ideal for interior corner areas.
Stable in Humid Conditions
Alder handles moisture without excessive movement. It helps maintain tight, clean corner lines over time.
Soft, Refined Appearance
Its warm tone and smooth finish create a refined look. Perfect for visible supports and elements that enhance your sauna’s overall design.
Specifications

What's Included

- Alder 3×3 Engineered Bench & Support Beams
- Square Edge (SHP) Profile
- Natural Alder Wood Material
Shipping Information
Wood products ship via standard freight. Shipping cost is calculated based on order quantity, board lengths, and your delivery location — it is not included in the listed price and will be quoted separately.
- Standard freight shipping on all wood orders
- Shipping cost varies by order size and destination
- Contact PROSAUNAS for a freight quote before ordering
- Bulk orders may qualify for volume pricing
- All orders inspected before shipment for quality assurance
📞 Have Questions?
Our team has 55+ years of experience helping builders select the right wood. We're happy to help you calculate quantities, confirm sizing, or get a shipping quote.
Call: (800) 957-2862
Email: info@peakprimalwellness.com
Mon–Fri 8:00am–5:00pm CT
The PROSAUNAS Quality Promise
PROSAUNAS carefully selects only the finest wood from Northern Europe and Canada, ensuring quality and consistency that meets our stringent standards. Every board is inspected before it ships — because a great sauna starts with great materials.
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Returns & Warranty
Return & Warranty